Self-balancing board



FIG. 1 is a perspective view of a self-balancing board showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevation view, with the right side being a mirror thereof; and,

FIG. 5 is a top plan view thereof. 

CLAIM The ornamental design for a self-balancing board, as shown and described. 